// Simple JQuery Draggable Plugin
// https://plus.google.com/108949996304093815163/about
// Usage: $(selector).drags();
// Options:
// handle => your dragging handle.
//           If not defined, then the whole body of the
//           selected element will be draggable
// cursor => define your draggable element cursor type

(function($) {
	$.fn.drags = function(opt) {

		opt = $.extend({handle:"",cursor:"move"}, opt);

		if(opt.handle === "") {
			var $el = this;
		} else {
			var $el = this.find(opt.handle);
		}

		return $el.css('cursor', opt.cursor).on("mousedown", function(e) {
			if(opt.handle === "") {
				var $drag = $(this).addClass('draggable');
			} else {
				var $drag = $(this).addClass('active-handle').parent().addClass('draggable');
			}
			var z_idx = $drag.css('z-index'),
				drg_h = $drag.outerHeight(),
				drg_w = $drag.outerWidth(),
				pos_y = $drag.offset().top + drg_h - e.pageY,
				pos_x = $drag.offset().left + drg_w - e.pageX;
			$drag.css('z-index', 1000).parents().on("mousemove", function(e) {
				$('.draggable').offset({
					top:e.pageY + pos_y - drg_h,
					left:e.pageX + pos_x - drg_w
				}).on("mouseup", function() {
					$(this).removeClass('draggable').css('z-index', z_idx);
				});
			});
			e.preventDefault(); // disable selection
		}).on("mouseup", function() {
			if(opt.handle === "") {
				$(this).removeClass('draggable');
			} else {
				$(this).removeClass('active-handle').parent().removeClass('draggable');
			}
		});

	}
})(jQuery);